A STUDY OF THE BLOCKING EFFECT OF PLASMA AND OF LYSED RED BLOOD CELLS ON DELAYED ALLERGIC REACTIONS

[摘要] A material which is capable of blocking the delayed type of allergic response can be found in human blood. The blocking material is seemingly in a higher concentration or in a more active form in material derived from the red blood cells than in the plasma. The blocking effect varies from recipient to recipient. The blocking effect is not uniquely directed towards any one antigen. The same blood may block either the tuberculin reaction or the trichophytin reaction, or both.